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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419f7a3ea0ea99e36cc1abe2c3fa791c9c44d425a0b478772a43bbb3303a801b' 
  AND token = 'zoRljn67QXEB7ogFDE6Yh5sJPzyflcWoNUAgMW/q9Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}